Image information transfer properties of x‐ray fluorescent screens

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Abstract
The image information [diagnostic X-ray] transfer efficiency for 5 X-ray fluorescent screens (calcium tungstate, barium halide and 3 rare earth screens) has been experimentally determined with monoenergetic X-ray beams at energies of 18, 22, 32, 49, 51, 58 and 69 keV. The transfer efficiency, which is defined by the ratio of the output to input signal-to-noise ratios, was determined from measurements of the fraction of incident X-rays absorbed in the screen and the statistical distribution of the number of light photons emitted from the screen per absorbed X-ray which was determined by light photon counting techniques. Comparisons of the information transfer efficiency, the average number of light photons emitted per absorbed X-ray, and the light output energy per Roentgen are given for the above screens and X-ray energies.

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